Question about Emerson MW8778 Microwave Oven

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Microwave oven recently my microwave oven will not heat anything, food or water.everything else seems to be working fine. I changed the fuse but still no heat. whats going on?

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This is usually caused by a bad door switch or loose door switch mount but other common causes of a failure to heat are:

- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya:

Posted on Nov 18, 2007


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Posted on Jan 02, 2017


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